Enable react/no-unstable-nested-components rule

Summary:
Dynamic nested components can cause tricky performance issues in React, as the reconciler will not be able to reuse the previously mounted component tree.

Changelog: [General] [Added] Added linter warning config for unstable nested components

Reviewed By: motiz88

Differential Revision: D33767283

fbshipit-source-id: 869ece99dc63cc3a150bae882d26df8541e8db59

packages/eslint-config-react-native-community/index.js

@@ -300,15 +300,16 @@ module.exports = {
     'react/no-multi-comp': 0,
     'react/no-string-refs': 1,
     'react/no-unknown-property': 0,
+    'react/no-unstable-nested-components': 1,
     'react/prop-types': 0,
     'react/react-in-jsx-scope': 1,
     'react/self-closing-comp': 1,
     'react/wrap-multilines': 0,
 
     // React-Hooks Plugin
     // The following rules are made available via `eslint-plugin-react-hooks`
-    'react-hooks/rules-of-hooks': 'error',
-    'react-hooks/exhaustive-deps': 'error',
+    'react-hooks/rules-of-hooks': 2,
+    'react-hooks/exhaustive-deps': 2,
 
     // React-Native Plugin
     // The following rules are made available via `eslint-plugin-react-native`